CN1198105A - Bimodal dense medium for fine particles separation in dense medium cyclone - Google Patents
Bimodal dense medium for fine particles separation in dense medium cyclone Download PDFInfo
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- CN1198105A CN1198105A CN96197291A CN96197291A CN1198105A CN 1198105 A CN1198105 A CN 1198105A CN 96197291 A CN96197291 A CN 96197291A CN 96197291 A CN96197291 A CN 96197291A CN 1198105 A CN1198105 A CN 1198105A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/44—Application of particular media therefor
- B03B5/442—Application of particular media therefor composition of heavy media
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Abstract
The present invention provides a method for separation of fine particles in a bimodal (two component) dense medium. In accordance with the present invention, the dense medium comprises ferromagnetic particles that have a relative density range from about 4.0 to 7.0 suspended in water and are characterized by a bimodal size distribution. Such a medium exhibits high stability and favourable rheological properties. The use of such a bimodal magnetite dense medium in cleaning fine coal in a dense medium cyclone or dynamic dense medium separator results in optimum separation efficiency when the medium contains approximately 20-40% fine and 60-80% coarse magnetite, and when the size ratio of coarse-to-fine magnetite is in the range of 5 to 10.
Description
Invention field
The present invention relates to fine grain new separation method in the dense medium.Particularly, the present invention relates to two particle size distribution is fine grain a kind of unique separation method in the dense medium (moisture and ferromagnetic particle) of feature.
Background of invention
Dense medium dynamic separator such as the dense medium cyclone separator is used for the dense medium mixture is separated into each part for many years.This class separator comprises the dense medium cyclone separator, cyclone separator, and NCB vorsyl separator, Dyna Whirlpool separator, three rotating disk separators, or the like.
The factor that influences dense medium cyclone separator performance can be divided three classes: medium character (composition), separator operation condition, and Material Characteristics.Though the separator operation condition designs based on Material Characteristics, the selection that right medium is formed must be decided according to the operating condition of Material Characteristics and separator simultaneously.According to this principle, fine grained separates needs to adopt high centrifugal acceleration, and this can pass through the inlet pressure of raising separator or reduce the separator diameter to obtain.Thin feed particles size and high centrifugal acceleration all require to adopt fine dense medium suspended substance.This promoted little magnetic (grind and ultra-fine ferromagnet, referring to No. the 5022892nd, United States Patent (USP)) development.
No. the 5022892nd, United States Patent (USP) (Klima etc., on July 11st, 1991 authorized) discloses a kind of method of clean shot coal, and shot coal and dense medium slurries are together as the charging of cyclone separator.Coal particle size distribution is between about 37～600 microns.Moisture and the ferromagnetic particle of dense medium, the latter's relative density is between about 4.0～7.0.The size of the ferromagnetic particle in the dense medium is not as good as about 15 microns, and, as for the size that very most of particle is arranged less than about 5 microns.In cyclone separator, shot coal and dense medium slurries are divided into one low severe product stream and one high severe product stream, and the relative density difference of two logistics is not more than about 0.2.Low severe and high severe logistics are after treatment from wherein reclaiming ferromagnetic particle.
Though adopt super-fine magnetite particle dense medium feasible technically, this also can cause serious problem.Main shortcoming comprises the rheologic behavio(u)r of this class medium bad (Y.B.He and J.S.Laskowski, the 12nd coal prepares conference [12th Int.Coal Preparation Congress], Krakow 1994, paper number paper C-8) with and high production cost.The close medium of high thickness can reduce fine grain separative efficiency, and is especially all the more so under high Media density.
The performance of dense medium cyclone separator (DMC) is subjected to the influence of dielectric behavior very big, particularly to fine grained (＜0.5mm) separation (Y.B.He and J.S.Laskowski, Mineral Engineering magazine [Minerals Engineering], 1994, volume Vol.7, page or leaf 209-221).Although rheological property and stability are that the fundamental property of medium is also directly related with the performance of DMC to a great extent, these performances can be controlled and be adjusted by forming of medium.Composition variable comprises the solid content (or Media density) of medium, magnet grains Size Distribution, grain shape, contaminated degree, and degaussing degree.To the dense medium of routine, desire is improved its stability, and the rheological property to medium has a negative impact unavoidably, and vice versa.To fine grain separation in the dense medium, this dilemma is more outstanding, and at that time, high centrifugal acceleration becomes thing institute unavoidably.
When the influencing of research magnet grains size, Stoessner and Zawadziki (the 3rd international hydraulic cyclone proceeding [Proc.3rd Int.Conf.on Hydrocyclones], Oxford, 1987) report once that the performance of DMC is more good when adopting thick magnet than the thin magnet of employing.Two people with this owing to viscosity under the thin magnet to the illeffects of the performance of DMC.When the iron ore under carrying out high Media density separated, Collins etc. (African IMM learns meeting will [J.S.Afr.IMM], 1974, rolls up Vol.12, page or leaf 103-119) had reported similar phenomenon.They advise adopting the spherical medium particle, and to reduce the influence of viscosity, they show that also than the irregularity particle that adopts through grinding, employing corresponding separative efficiency behind (sphere) ferrosilicon of atomizing is higher.On the other hand, the size that increases magnet grains can be destroyed the stable of medium.So when estimating the performance of 250mm DMC when separating coal, Sokaski and Geer (United States Bureau of Mines [U.S.Bureau of Mines], RI6274 (2963)) find that thin magnet can make separation more remarkable.(African IMM learns meeting will [J.S.Afr.IMM] to Fourie etc., 1980, volume Vol.80, page or leaf 357-361) and Chedgy etc. (the 10th international coal prepares conference [Proc.10th Int.Coal Preparation Congress], Edmonton 1986, pp.60-79) also reported similar discovery.These researchs claim that all magnet is refinement all the more, and dielectric stability is improved, and institute's separative efficiency that obtains is good more.Suggestions such as Fourie have obvious separation for making coal, and the size of the magnet of at least 50% (weight) should be below 10 microns.
Under low Media density, if adopt technical grade magnet, discoveries such as aforementioned Chedgy, when promoting the inlet pressure of cyclone separator, separative efficiency worsens, and under high feed pressure, the performance of reduced size cyclone separator is not as good as the performance that is in the large-size cyclone separator under the similar experimental condition.(the 11st international coal prepares conference [Proe.11th Int.CoalPreparation Congress], and Tokyo 1990, pp.145-149) observes, and adopts miniaturization magnet (90% (weight)＜5 according to Klima and Killmeyer
aM) carry out the separation of duff, when the inlet pressure of cyclone separator increased to 35～372kPa, separative efficiency was greatly improved.These different results show, under aforesaid first kind of situation, to thick industrial magnet, the detrimental effect that segregation produced that increases medium has been cleared up the benefit of bringing in the obtained down big centrifugal acceleration of high inlet pressure (or less cyclone separator diameter).Yet under aforesaid second kind of situation, highly stable miniaturization magnet medium has guaranteed when adopting high centrifugal acceleration and has not impelled the high-density medium generation of excessively emanating.
The ore dressing of the general and Bed for Fine Coal of the following several patents of Kindig, magnet and dense medium cyclone separator are relevant.
United States Patent (USP) the 5348160th (Kindig, on September 20th, 1994 authorized) discloses the ore dressing of Bed for Fine Coal in the dense medium cyclone separator, and separator designs especially, to improve the acceleration of particle, improves separative efficiency.The raw coal raw materials size is earlier through selecting, to remove the duff particle.The coarse grain component is separated into clean coal subsequently, middle coal and waste coal.Middle coal adds pulverizing again to be used as the fine component ore dressing.The a plurality of components that in the dense medium cyclone separator, are divided into different nominal sizes fine component is washed mud in adverse current cyclone separator loop after again.Dense medium contains the ultra-fine magnet grains of narrow size distribution, and the latter is in order to promote the recovery that separates and improve magnet.Magnet reclaims separately in the component that each is told, and the non-magnetic of a certain component goes out the recovery that flowing water is diluted to thinner component with raw material and improves all coals and magnet simultaneously.It is to add in the recovery unit of design according to the spy to carry out that magnet is recovered in particle size, and final slightly the washing in device-clarifier-washer loop of magnetic drum separator that is equipped with high strength magnet that be separated in carried out.
United States Patent (USP) the 5277368th (Kindig, on January 11st, 1994 authorized) discloses the ore dressing of Bed for Fine Coal in the dense medium cyclone separator, and separator designs especially, to improve the acceleration of particle, improves separative efficiency.The raw coal raw materials size is earlier through selecting, to remove the duff particle.The coarse grain component is separated into clean coal subsequently, middle coal and waste coal.Middle coal adds pulverizing again to be used as the fine component ore dressing.The a plurality of components that in the dense medium cyclone separator, are divided into different nominal sizes fine component is washed mud in adverse current cyclone separator passage after again.Dense medium contains the ultra-fine magnet grains of narrow distributed dimension, and the latter is in order to promote the recovery that separates and improve magnet.Magnet reclaims separately in the component that each is told, and the non-magnetic of a certain component goes out the recovery that flowing water is diluted to thinner component with raw material and improves all coals and magnet simultaneously.It is according to carrying out in the custom-designed recovery unit that magnet is recovered in particle size, and final slightly the washing in device-clarifier-washer loop of magnetic drum separator that is equipped with high strength magnet that be separated in carried out.
United States Patent (USP) the 5262962nd (Kindig, authorized on November 16th, 1993) beneficiation method of thin solid shot disclosed, this method is chosen magnet and is made dense medium, and the relative dense medium of solid shot is in suspended state, so that solid is as being both the suitable liquid of proportion and dense medium.This method comprises to be determined that the diameter of magnet grains write music for a song on the line making solid shot/magnet diameter ratio be in the diameter score.This invention also comprises adopts the magnet of particle diameter less than about 0.005mm and the about 0.0025mm of average diameter.This magnet forms on the iron chloride aqueous solution by the gas phase high-temperature hydrolysis.This invention and then comprise the method for determining dense medium separation process separative efficiency.This method comprises the apparent distance of determining to be able at dense medium cyclone separator endoparticle the required motion of correct ore dressing.Known this apparent distance, particle are able to correct ore dressing required superficial velocity and can be regarded as.This superficial velocity is with cyclone separator physical dimension and operating parameter, as the convergency value that calculates the separative efficiency characterization parameter.This patent also discloses definite cyclone separator physical dimension and operating parameter method, comprises with efficient being optimization aim, determines separative efficiency and adjusts physical dimension and parameter.
United States Patent (USP) the 5096066th (Kindig, authorized on May 17th, 1992) beneficiation method of thin solid shot disclosed, this method is chosen magnet and is made dense medium, and the relative dense medium of solid shot is in suspended state, so that solid is as being both the suitable liquid of proportion and dense medium.This method comprises to be determined that the diameter of magnet grains write music for a song on the line making solid shot/magnet diameter ratio be in the diameter score.This invention also comprises adopts the magnet of particle diameter less than about 0.005mm and the about 0.0025mm of average diameter.This magnet forms on the iron chloride aqueous solution by the gas phase high-temperature hydrolysis.This invention also comprises the method for determining dense medium separation process separative efficiency.This method comprises the apparent distance of determining to be able at dense medium cyclone separator endoparticle the required motion of correct ore dressing.Known this apparent distance, particle are able to correct ore dressing required superficial velocity and can be regarded as.This superficial velocity is with cyclone separator physical dimension and operating parameter, as the convergency value that calculates the separative efficiency characterization parameter.This patent also comprises determines cyclone separator physical dimension and operating parameter method, comprises with efficient being optimization aim, determines separative efficiency and adjusts physical dimension and parameter.
Brief summary of the invention
In the broadest sense, the present invention relates to the new prescription of ferromagnet particle size distribution, so make particle have the dielectric behavior of optimization.The invention provides the method for separate fine particles in two distributions (two constituent elements) dense medium.According to the present invention, dense medium contains the ferromagnet particle, the relative density of particle between about 4.0～7.0 and particle suspend in water, particle is a feature with two Size Distribution.The good stability of this class medium, rheologic behavio(u)r is good.Usually, the present invention is applicable to the dense medium separator.Particularly, the Bed for Fine Coal that this pair of Size Distribution dense medium is used for the dense medium cyclone separator purifies, and separative efficiency is good.
In a specific embodiment, the present invention includes the fine grained that density is different and be divided into the method for different densities component, this method comprises to dense medium separator adding dense medium, moisture and the ferromagnetic particle of the latter, the relative density of particle is between about 4.0～7.0 and be two Size Distribution, include thin component 20% (weight)～40% (weight) and thick component 60% (weight)～80% (weight), thick/fine particle size ratio is between about 5～10.
In this method, separator can be the dense medium cyclone separator, and the raw material that adds to the dense medium cyclone separator contains size less than 600 microns duff particle, and the relative density of the ferromagnetic dense medium of two distributions is between about 1.2～1.9.Ferromagnetic particle in the dense medium is Fe
3O
4Or FeSi.
The present invention also comprises the method for coal washing, this method comprises in the dense medium cyclone separator and adds mixture, described mixture contains (a) duff particle, (b) water and (c) ferromagnetic particle, the relative density of particle is between about 4.0～7.0 and be two Size Distribution, feature is thin component 20% (weight)～40% (weight) and thick component 60% (weight)～80% (weight), and thick/fine particle size ratio is between about 5～10.
In this method, the inlet pressure when mixture adds the dense medium separator is between about 40～400kPa.The duff particle size is less than 600 microns, and the relative density of the ferromagnetic dense medium of two distributions is between about 1.2～1.9.
Thin ferromagnetic particle size range can be between about 1～10 micron, and crude iron magnetic particle size range is between about 10～45 microns.
The present invention aims to provide the method for allotment dense medium particle size distribution.The distribution of this optimization improved stability, the viscosity of the dense medium that has reduced.
The invention still further relates to fine graineds in the dense medium dynamic separator that density is different used dense medium when being divided into the different densities component, described dense medium contains (a) water and reaches (b) ferromagnetic particle, the relative density of particle is between about 4.0～7.0 and be two Size Distribution, feature is to contain about 20% (weight)～40% (weight) of thin component and thick component 60% (weight)～80% (weight), and thick/fine particle size ratio is between about 5～10.
The present invention and then the method for carrying dense various mineral grain (as diamond) in advance is provided, wherein, the relative density of medium is between 1.7～3.2.In so high density range, it will be more remarkable adopting the advantage of two ferromagnetic dense mediums of Size Distribution.
The accompanying drawing summary
Attached each figure in back only is used to illustrate specific embodiments of the present invention, does not constitute the qualification to flesh and blood of the present invention and scope in all senses.
Fig. 1 illustrates the flow chart of 6 inches dense medium cyclone separator circulations.
Fig. 2 illustration medium is formed the influence to the DMC separative efficiency.
Fig. 3 illustrates the functional relation of dielectric stability and ferromagnetic particle Size Distribution and Media density.
Fig. 4 illustrates the functional relation of fine grained proportioning in separative efficiency and the two distribution dense mediums.
Fig. 5 illustrates the influence of two distribution dense mediums compositions to density contrast.
Fig. 6 illustrates the influence of two distribution dense mediums compositions to the point of contact translation difference.
DESCRIPTION OF THE PREFERRED
We find, form with the DMC separating medium that two distributed magnet suspensions can obtain to optimize.This composition not only can improve the stability of medium but also can reduce the yield stress of medium.In fine grain DMC separated, we found that the rheologic behavio(u)r of separative efficiency and medium is closely related.When thin magnet accounted for about 25% (weight) of magnet total content, the Ep value was minimum.To two distribution suspensions, this optimization that consists of on the rheology meaning is formed.On the other hand, the relation of point of contact translation difference and dielectric stability is more close; The proportioning that increases particulate magnet in the medium can reduce density contrast, thereby makes the point of contact translation difference continue to reduce.
In first group of test, conventional magnet sample ( Mag# 1,2,3 and 4) is used to make dense medium, and the Media density scope is between 1.2～1.7g/cm
3(% (weight) solid).Particle size is suitable to be described with the Rosin-Rammler-Bennet particle size distribution.Mag# 1 is a technical grade magnet, is provided by Craigont Mines.Mag#2 is the product after Mag# 1 is ground in ball mill.Mag# 3 and Mag#6 are the classification product Mag# 1 is removed segmentation in the classification cyclone separator after.Mag# 4 and Mag#5 are that miniaturization magnet (is respectively 70% (weight)＜5
aM and 90% (weight)＜5
aM), provide by USDOE Pittsburgh energy technology center.The density tracer that is marked with color derives from Partitionz responsibility Co., Ltd (Austrilia), as the raw material of cyclone separator.Adopt three kinds of narrow dimension components in the test: 4.0 * 2.0,1.0 * 0.71 and 0.5 * 0.355mm.Table 1 is listed the RRB size and the modulus of distribution of 6 kinds of magnet samples.As the table shows, the particle size range that these magnet samples are contained is wide, and is little of d
63.2=2.7 μ m, thick magnet can be to d
63.2=35.0 μ m.
The RRB size and the modulus of distribution of table 1 magnet sample
| Sample | ????d 63.2(μm) | ????m |
| ????Mag#1 | ????30.5 | ????3.5 |
| ????Mag#2 | ????18.0 | ????1.6 |
| ????Mag#3 | ????33.0 | ????4.1 |
| ????Mag#4 | ????4.3 | ????1.9 |
| ????Mag#5 | ????2.7 | ????2.5 |
| ????Mag#6 | ????35.0 | ????3.9 |
In separation test, the density tracer of different densities is in released state each other usually.In each test, only there is a kind of density components to feed the cyclone separator loop from the top case.The minimum dosage of each component is about 100 grams, shows that the tracer grain of overflow and underflow is reclaimed by two sieves that are installed in the sampling box, and recycles by the mounting medium of sieve.The tracer grain that two sieves are held back is through flushing, and is dry and weigh separately.This result is used for the dispensed number.With the component whole process repeated of different densities, obtain enough data points for drawing distribution curve.For guaranteeing accurately, carry out repeated test to especially being near the data point of separation cut point.In the test overall process, the density and the flow of overflow and underflow are monitored.By these data, can be regarded as overflow/underflow density contrast when.
Separation test carries out in 6 inches dense medium cyclone separator loops.6 inches cyclone separators (model D6B-12-S2B7) derive from Krebs international project master's master department (California).This separator is by gravity charging, 60.6 inches fluid columns of inlet pressure (10 times of separator diameters).Relevant this respect, referring to Y.B.He and J.S.Laskowski, Mineral Engineering magazine [Minerals Engineering], 1994, volume Vol.7, page or leaf 209-221, the theme of this article is introduced as reference herein in the lump.Loop structure is optimized according to He and the given condition of Laskowski earlier.Adopting 2.5 inches vortex finders and 2.0 inches valves to obtain the medium shunt ratio is 1.8, and this is in the scope (2 ± 0.5) of recommendation.Fig. 1 illustrates the flow chart of 6 inches dense medium cyclone separator circulations.
Fig. 2 illustrates the functional relation of separative efficiency and Media density and particle size.In the relation of Ep value and Media density, can be observed the trend of two contradictions.To Mag# 1, Mag# 2 and Mag# 4 dense medium, the Ep value increases with Media density, and thick Mag# 3 dense medium is reduction trend.
This class opposite tendency is attributable to dielectric stability and the rheologic behavio(u)r reciprocal effect to the DMC performance.To thin magnet dense medium (Mag# 1, Mag# 2 and Mag#4), dielectric stability height.As shown in Figure 3, in the whole test density range, density contrast is limited to 0.5g/cm
3Below.According to (African IMM learn meeting will [J.S.Afr.IMM], 1974, rolls up Vol.12, page or leaf 103-119) such as Collins, the unstability of this class medium is also not obvious to the detrimental effect of separative efficiency.Further increase Media density and then improve the stability of medium very little in the effect of separative efficiency.On the other hand, the degree of refinement of these magnet samples has made the corresponding dense medium very thickness that becomes.Increase Media density and can sharply strengthen the rheol detrimental effect of medium, the latter is become influences the primary variables of DMC performance.So, increase Media density and cause separative efficiency deterioration and Ep value to increase.
To thick Mag# 3 dense medium, trend antithesis.In this case, the yield stress of Mag# 3 dense medium and viscosity become minimum because of its thick particle size.To this situation, increase the rheologic behavio(u)r that Media density can't significantly change medium, the medium rheology is also not obvious to the respective action of DMC performance.On the other hand, the stable extreme difference of Mag# 3 dense medium, its density contrast scope is between 0.8～1.0g/cm
3(see figure 3).The dielectric stability of extreme difference is unfavorable to the performance of DMC.Increase Media density and can improve the stable (see figure 3) of medium and the performance (see figure 2) of DMC.
Result shown in Figure 2 shows, adopts miniaturization magnet (Mag#4) dense medium to suppress DMC and separates, at high Media density scope (＞1.5g/cm
3) especially true, and best DMC performance is available from thicker Mag#1 (technical grade) dense medium.Yet, these as a result (see figure 2) under low inlet pressure, obtaining.As shown in Figure 3, the density contrast of Mag# 1 dense medium is near the upper limit of recommendations such as Collins.Be in and cause medium segregation excessive and influence separative efficiency under the high centrifugal acceleration.As discussion hereinafter, increase with inlet pressure, adopt the performance of the DMC of above-mentioned two kinds of magnet dense mediums can present different results.Adopt Mag# 4 efficient to improve, adopt Mag# 1 efficient to reduce.In other words, the performance of DMC not merely depends on the performance or the composition of medium, and depends on the operating condition of cyclone separator.When the operating condition of DMC changes, may be not favourable to a kind of composition that is operating as optimization to another operation.
Be also shown in by Fig. 2, the Ep value is the function of magnet grains size with the speed that dense medium increases.The increase of Ep value under higher density of thin magnet medium is very fast.Media density is higher than 1.5g/cm
3The time, the Ep value of miniaturization magnet (Mag#4) increases the rapidest.Increased in turn by Mag# 4 to Mag# 1 with the magnet grains size, the Ep value is with the rate of change of the Media density trend that tapers off.Finally, be the boundary with Mag# 3, the Ep value becomes negative value.By two kinds among Fig. 2 opposite trend deducibilitys, between Mag# 1 and Mag# 3, there is certain magnet sample, for this magnet sample, separative efficiency is not subjected to the influence of Media density in certain density range.
As shown in Figure 2, at low Media density scope (＜1.5g/cm
3), adopt Mag# 1 or Mag# 2 dense medium can obtain preferable separative efficiency.The feature of this two medium is medium sized particle size distribution, and it can keep higher dielectric stability not applying to medium under the condition of high yield stress or viscosity.At high Media density scope (＞1.5g/cm
3), the rheologic behavio(u)r of medium becomes the leading factor of the performance that influences DMC.Be necessary to adopt thick magnet (Mag#4) this moment, to reduce the rheol effect of medium and to obtain gratifying separative efficiency.
The above results also shows, the magnet grains Size Distribution the rheologic behavio(u)r of adjusting medium and stable aspect even more important than its peak value particle size.Though Mag# 1 has identical peak value particle size (remove fine grained and get Mag# 3 in Mag#1) with Mag# 3, obtain diverse result but carry out the DMC separation with these two kinds of magnet samples.A more surprising paradox improving dielectric behavior is, the rheologic behavio(u)r of improving medium by the composition that changes medium causes dielectric stability to reduce usually, and vice versa.A method that addresses this problem is to adopt two distribution dense mediums.Known already, two distribution suspensions have very unique rheologic behavio(u)r; Contain segmentation in two distribution suspensions and account for 25% of total solid content～40% o'clock, its apparent viscosity minimum (C.Parkinson etc., colloid and interface science magazine [J.Coll.Interf.Sci.],, volume Vol.33, page or leaf 150-160 in 1970; J.S.Chong etc., journal of applied [J.Appl.Polymer Sci.],, volume Vol.15, page or leaf 2007-2021 in 1971; F.Ferrini etc., waterpower is carried conference collection of thesis [Proc.9th Int.Conf.on Hydraulic Transport of Solids in Pipes], Rome, 1984 in the 9th the international solid tube).
For making two distribution suspensions show its unique rheologic behavio(u)r especially, the size of thick, thin component differs at least should be between 5～7 times (R.K.McGeary, U.S.'s ceramics can will [J.Am.CeramicSoc.], and 1961, volume Vol.44,513-522; H.A.Barnes, rheology introduction, three [An Introduction to Rheology, Rheology Series 3] of rheology series of books, Elsevier, NewYork, 1989).In the test herein, Mag# 4 and Mag#6 are used separately as thin and coarse granule, and their size was than about 8: 1 (seeing Table 1).According to the result among Fig. 2, the medium rheology is only obvious when Media density is high to the DMC Effect on Performance.So, adopt the beneficial effect of two distribution dense mediums in the higher scope of Media density, preferably to be embodied.Correspondingly, two distribution medium density stuck-at-.55g/cm in the test herein
3
At fixing 1.55g/cm
3Under the Media density, as seen from Figure 4, the Ep value is followed same trend to response and apparent viscosity that segmentation percentage composition in the medium changes.Separation test in 6 inches dense medium cyclone separators shows that separative efficiency is obviously improved behind the two distribution dense mediums of employing; (0.5 * 0.355mm) is especially true to thin feed particles.With 0.5 * 0.355mm particle is that the Ep value of two distribution dense mediums of raw material is about 0.035, but to Mag#6 identical with its Media density and Mag# 4 dense medium (segmentation content is respectively 0% (weight) and 100% (weight)), corresponding Ep value is respectively 0.065 and 0.075.When two distributed magnet dense mediums contained the thin magnet of about 20% (weight), it is optimum that separative efficiency reaches.
The stability of two distribution dense mediums is directly not relevant with the rheologic behavio(u)r of medium.Fig. 5 shows that with the increase of segmentation percentage composition, density contrast continues to descend, and it is more unstable that medium also becomes.Can infer that density contrast mainly is limited by the classification of thick magnet component in the medium, for thick magnet component, thin magnet suspension is equivalent to its medium.The increase of segmentation percentage composition not only suppresses coarse grained classification in the medium, and reduces the degree of classification by the content that reduces thick magnet.This can by underflow density reduce be confirmed.
More relevant opposite with the rheologic behavio(u)r of separative efficiency and medium, point of contact translation difference (being defined as the difference of separation cut point) and Media density stability close and medium is more closely related.As Fig. 5 and shown in Figure 6, point of contact translation difference and density contrast are all followed close trend to the response that thin magnet content increases.
By the introduction of front, to those skilled in the art, be obvious and possible to flesh and blood and the scope of doing multiple accommodation and modification and not deviating from wherein of the present invention.Therefore, scope of the present invention is defined according to following claim clause.
Claims (26)
1. the fine grained that density is different is divided into the method for different densities component, this method comprises to dense medium separator adding dense medium, moisture and the ferromagnetic particle of the latter, the relative density of particle between about 4.0～7.0 and particle be two Size Distribution, feature is to contain thin component 20% (weight)～40% (weight) and thick component 60% (weight)～80% (weight), and thick/fine particle size ratio is between about 5～10.
2. the process of claim 1 wherein that separator is a whirlwind separator.
3. the method for claim 2, wherein, separator is the dense medium cyclone separator, the dense medium raw material that adds to the dense medium cyclone separator contains size less than 600 microns duff particle, and the relative density of two distribution dense mediums is between about 1.2～1.9.
4. the method for claim 2, wherein, the ferromagnetic particle in the dense medium is Fe
3O
4
5. the method for claim 3, wherein, the ferromagnetic particle in the dense medium is Fe
3O
4
6. the method for claim 2, wherein, the ferromagnetic particle in the dense medium is FeSi.
7. the method for claim 3, wherein, the ferromagnetic particle in the dense medium is FeSi.
8. the method for a coal washing, this method comprise in the dense medium cyclone separator and add mixture that described mixture contains
(a) duff particle;
(b) water; And
(c) ferromagnetic particle, the relative density of particle between about 4.0～7.0 and particle be two Size Distribution, feature is to contain thin component 20% (weight)～40% (weight) and thick component 60% (weight)～80% (weight), thick/fine particle size is than between about 5～10.
9. the method for claim 8, wherein, the inlet pressure when mixture adds the dense medium separator is between about 40～400kPa.
10. the method for claim 8, wherein, the duff particle size is less than 600 microns.
11. the method for claim 10, wherein, the relative Media density of two distributed magnet dense mediums is between about 1.2～1.9.
12. the method for claim 11, wherein, ferromagnetic particle is selected from Fe
3O
4And FeSi.
13. the method for claim 8, wherein, the size of ferromagnetic particle is less than about 15 microns.
14. the method for claim 8, wherein, thin ferromagnetic particle size range is between about 1～10 micron, and crude iron magnetic particle size range is between about 10～45 microns.
Add mixture 15. the method for a coal washing, this method comprise in the dense medium dynamic separator, described mixture contains
(a) duff particle;
(b) water; And
(c) ferromagnetic particle, the relative density of particle between about 4.0～7.0 and particle be two Size Distribution, feature is to contain thin component 20% (weight)～40% (weight) and thick component 60% (weight)～80% (weight), thick/fine particle size is than between about 5～10.
16. used dense medium when the fine grained that density is different is divided into the different densities component in the dense medium dynamic separator, described dense medium contains
(a) water; And
(b) ferromagnetic particle, the relative density of particle between about 4.0～7.0 and particle be two Size Distribution, feature is to contain about 20% (weight)～40% (weight) of thin component and thick component 60% (weight)～80% (weight), and thick/fine particle size ratio is between about 5～10.
17. the medium of claim 16, wherein, separator is a whirlwind separator.
18. the medium of claim 16, wherein, dense medium contains size less than 600 microns duff particle, and the relative Media density of two distribution dense mediums is between about 1.2～1.9.
19. the medium of claim 16, wherein, the ferromagnetic particle in the dense medium is Fe
3O
4
20. the medium of claim 16, wherein, the ferromagnetic particle in the dense medium is FeSi.
21. used dense medium during coal washing in the dense medium cyclone separator, described dense medium contains the mixture of following component
(a) duff particle;
(b) water; And
(c) ferromagnetic particle, the relative density of particle between about 4.0～7.0 and particle be two Size Distribution, feature is to contain about 20% (weight)～40% (weight) of thin component and thick component 60% (weight)～80% (weight), and thick/fine particle size ratio is between about 5～10.
22. the medium of claim 21, wherein, the duff particle size is less than 600 microns.
23. the medium of claim 21, wherein, the relative Media density of two distributed magnet dense mediums is between about 1.2～1.9.
24. the medium of claim 21, wherein, ferromagnetic particle is selected from Fe
3O
4And FeSi.
25. the medium of claim 21, wherein, the size of ferromagnetic particle is less than about 15 microns.
26. the medium of claim 21, wherein, thin ferromagnetic particle size range is between about 1～10 micron, and crude iron magnetic particle size range is between about 10～45 microns.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/521,371 | 1995-08-31 | ||
| US08/521,371 US5819945A (en) | 1995-08-31 | 1995-08-31 | Bimodal dense medium for fine particles separation in a dense medium cyclone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1198105A true CN1198105A (en) | 1998-11-04 |
Family
ID=24076488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96197291A Pending CN1198105A (en) | 1995-08-31 | 1996-08-28 | Bimodal dense medium for fine particles separation in dense medium cyclone |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5819945A (en) |
| CN (1) | CN1198105A (en) |
| AU (1) | AU717919B2 (en) |
| CA (1) | CA2230074A1 (en) |
| WO (1) | WO1997007894A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773308A (en) * | 2019-09-26 | 2020-02-11 | 天地（唐山）矿业科技有限公司 | Method for calculating distribution curve of three-product cyclone on line |
| CN117018989A (en) * | 2023-10-10 | 2023-11-10 | 长沙邦盛新能源有限公司 | Composite lithium iron phosphate positive electrode material product mixing system and process |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6422494B1 (en) | 2000-02-03 | 2002-07-23 | Hazen Research, Inc. | Methods of controlling the density and thermal properties of bulk materials |
| US6820829B1 (en) * | 2000-02-25 | 2004-11-23 | Exportech Company, Inc. | Method and apparatus for separating material |
| IT1317994B1 (en) * | 2000-06-26 | 2003-07-21 | Ecomin S R L | METHOD AND POWER SUPPLY FOR DYNAMIC SEPARATORS. |
| US6786941B2 (en) | 2000-06-30 | 2004-09-07 | Hazen Research, Inc. | Methods of controlling the density and thermal properties of bulk materials |
| US6742656B2 (en) * | 2002-03-12 | 2004-06-01 | Sedgman, Llc | Common correct media sump and wing tank design |
| AU2003254114A1 (en) * | 2002-07-22 | 2004-02-09 | Mba Polymers, Inc. | Controlling media particle size in slurried dense media separations |
| AU2004225714A1 (en) * | 2003-03-31 | 2004-10-14 | Invest In Property 19 (Proprietary) Limited | Fuel element |
| CN101112696B (en) * | 2007-08-03 | 2010-06-16 | 夏玉才 | Sub-dense medium separation technics and sub-heavy-media separator |
| CN104437833B (en) * | 2014-11-07 | 2017-11-24 | 贵州省贵金属矿产资源综合利用工程技术研究中心有限公司 | A kind of method of physical upgrading enrichment carbonaceous shale type navajoite |
| CN106964483B (en) * | 2017-04-28 | 2019-02-26 | 中国矿业大学 | A kind of unpressurized feeding dense medium cyclone coal separation process autocontrol method and system |
| CN112827639B (en) * | 2021-02-07 | 2023-06-30 | 西安建筑科技大学 | Method for preparing high-dispersibility heavy medium for coal preparation from magnetite-containing fine tailings |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2430702A (en) * | 1944-01-12 | 1947-11-11 | Toledo Scale Co | Weighing scale |
| US2430762A (en) * | 1944-06-12 | 1947-11-11 | Minerals Beneficiation Inc | Ferrosilicon-magnetite as heavy media in separtion of ores |
| US4140628A (en) * | 1975-08-08 | 1979-02-20 | Horsfall David W | Dense medium separation |
| US4128474A (en) * | 1977-03-24 | 1978-12-05 | Linatex Corporation Of America | Process for cleaning and dewatering fine coal |
| GR76426B (en) * | 1981-05-21 | 1984-08-10 | Snam Progetti | |
| US4470901A (en) * | 1982-07-28 | 1984-09-11 | Bethlehem Steel Corp. | System for controlling separating gravity in dense-media cyclone |
| CA1327342C (en) * | 1987-11-30 | 1994-03-01 | James Kelly Kindig | Process for beneficiating particulate solids |
| US5262962A (en) * | 1987-11-30 | 1993-11-16 | Genesis Research Corporation | Process for beneficiating particulate solids |
| US5022892A (en) * | 1990-01-03 | 1991-06-11 | United States Department Of Energy | Fine coal cleaning via the micro-mag process |
| WO1993007967A1 (en) * | 1991-10-15 | 1993-04-29 | Genesis Research Corporation | Coal cleaning process |
-
1995
- 1995-08-31 US US08/521,371 patent/US5819945A/en not_active Expired - Fee Related
-
1996
- 1996-08-28 AU AU67296/96A patent/AU717919B2/en not_active Ceased
- 1996-08-28 CN CN96197291A patent/CN1198105A/en active Pending
- 1996-08-28 WO PCT/CA1996/000575 patent/WO1997007894A1/en active Search and Examination
- 1996-08-28 CA CA002230074A patent/CA2230074A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773308A (en) * | 2019-09-26 | 2020-02-11 | 天地（唐山）矿业科技有限公司 | Method for calculating distribution curve of three-product cyclone on line |
| CN117018989A (en) * | 2023-10-10 | 2023-11-10 | 长沙邦盛新能源有限公司 | Composite lithium iron phosphate positive electrode material product mixing system and process |
| CN117018989B (en) * | 2023-10-10 | 2023-12-26 | 长沙邦盛新能源有限公司 | Composite lithium iron phosphate positive electrode material product mixing system and process |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2230074A1 (en) | 1997-03-06 |
| AU6729696A (en) | 1997-03-19 |
| US5819945A (en) | 1998-10-13 |
| WO1997007894A1 (en) | 1997-03-06 |
| AU717919B2 (en) | 2000-04-06 |
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